While vehicle owners need to have some basic car knowledge, it’s often best to let professionals handle more complex car repair projects. Simple things like checking fluid levels, changing flat tires or cleaning the battery terminals are pretty simple and are easy to do yourself. More complicated jobs like replacing your transmission should always be done by a mechanic. Car Repair Work You Should Know How to Do Yourself Changing Flat Tires Eventually, flat tires happen to everyone. Always keep a car jack and a spare tire in the trunk for emergencies. Once you’ve replaced the flat with your spare, be sure to secure the lug nuts in a star pattern to ensure the tire is secure. Tighten the bolts